Improvement in thread-controllers for sewing-machines



PRATT & MAYNARD.

Sewing Machme. I No. 98,409. Patented Dec. 28, 1869.

k. 2. fwm fdzh w UNITED STATES PATE T @FFICE.

GEORGE M. PRATT AND L. E. MAYNARD, OF MIDDLETOWN, OONN., ASSIGNORS TOTHE FINKLE & LYON MANUFACTURING COMPANY, OF SAME PLACE.

IMPROVEMENT IN THREAD-CONTROLLERS FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 98,409, dated December28, 1869.

To all whom it may concern:

Be it known that we, GEORGE M. PRATT and L. E. MAYNARD, of Middletown,in the county of Middlesex and State of Connecticut, have invented a newImprovement in Sewing- Machines and we do hereby declare the following,when taken in connection with the accompanying drawings and the lettersof reference marked thereon, to be a full, clear, and exact descriptionof the same, and which said drawings constitute part of thisspecification, and represent, in-

Figure 1, a front View of the head with the take-up in its highestposition; and in Fig. 2, the same with the take-up in its lowestposition.

This invention relates to an improvementin sewing-machines in which avertical needlebar is arranged for the carrying of the needle, theobject being to supply and take up the necessary slack for the looper orshuttle below the work-table and the invention consists in thearrangement of a slotted lever operating transversely across the path ofthe needle-bar by connecting the slot of the said lever to theneedle-bar and passing the thread through a fixed eye on the machinedown to a fixed eye below the lowest extreme movement of the said lever,thence up through an eye formed in the end of the said lever, thencedown to the needle, where it is arranged in the usual manner. 1

To enable others skilled in the art to construct and use ourimprovement, we will proceed to describe the same as illustrated in theaccompanying drawings.

A is the head of the machine-arm; B, the needle-bar, of common andwell-known con= struotion. Through the {,head a slot, 0, is formed infront of the needle-arm, and through this slot a stud, a, fixed on theneedle-bar, works.

I D is a lever pivoted at d onto the head,-

and slotted so as to connect with the stud a, and so that the movementof the needle-bar down and up will carry the said lever from one extremeto the other and return, as from the position in Fig. 1 to that in Fig.2 and return, thus working transversely across the path of theneedle-bar.

The thread (represented in broken lines) is first passed through an eye,E, fixed at any convenient point on the head, thence down to an eye, F,below the extreme movement of the lever, thence up through an eye,f, inthe lever, thence down to the needle, where it is arranged for operationin the usual manner. By this construction-that is, doubling the threadby passing it through the lower eye,F the quantity of thread slackenedby the descent of the lever is three times the movement of the lever,and this may be timed to slack or take up relatively to the movement ofthe needle by forming the slot in the lever of such shape that itsmovement, combined with the movement of the needle, will slack or takeup at the required time.

Having fully described our invention, what we claim as new and useful,and desire to secure by Letters Patent, is-

The slotted lever D, constructed as shown. and arranged transverselyacross the path of the needle, in combination with the pin a on theneedle-bar and the fixed eyes E and F, all operating substantially inthe manner and for the purpose herein set forth.

GEO. M. PRATT. 'L. E. MAYNARD.

Witnesses:

E. AGKLEY, J OHN L. S. ROBERTS.

